A certain airport runway of length L allows planes to
accelerate uniformly from rest to takeoff speed
using the full length of the runway. Because of
newly designed planes, the takeoff speed must be
doubled, again using the full length of the runway
and having the same acceleration as before.

Respuesta :

The length of the new runway In terms of (L) is 4L.

Your question is incomplete, it seems your question is missing the following information below;

"In terms of (L) , what must be the length of the new runway?"

The given parameters;

  • length of the runway, = L
  • let the take off speed = V₁

For the newly designed planes;

the take off speed is double of the original = 2V₁

the acceleration for both take is constant = a

The take off speed for the given constant acceleration is given as;

[tex]v^2 = u^2 + 2as\\\\v^2 = 0 + 2as\\\\v^2 = 2as\\\\a = \frac{v^2}{2s} \\\\[/tex]

The length of the new runway In terms of (L) is calculated as follows;

[tex]a = \frac{v_1^2}{2s_1} = \frac{v_2^2}{2s_2} \\\\substitute \ the \ corresponding \ values \ for \ initial \ acceleration \ and \ new \\acceleration\\\\\frac{v_1^2}{2L} = \frac{(2v_1)^2}{2s_2}\\\\2s_2v_1^2 = 2L(4v_1^2)\\\\s_2 = \frac{2L(4v_1^2)}{2v_1^2} = \frac{8Lv_1^2}{2v_1^2} = 4L[/tex]

Thus, the length of the new runway In terms of (L) is 4L.

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